Have you had any of the Red Shouldered White Yokohama from McMurray Hatchery?
I had some pullets a few years back, and liked them.
Some details about the ones I had:
I bought them in midsummer. They began laying earlier in the fall than the other rare breeds in the order, laid nicely through the winter, and then went broody in the spring. I did not give them a chance to hatch chicks, so I cannot tell how good they would be as mothers. They were not obviously bullies or victims. I had 6 of them, and could distinguish almost all of them by differences in how much red, and by slight variations in size & shape (maybe not a good trait, since purebreds are supposed to match, but pleasant for me in a backyard flock.) I don't think any of them lived past age 1-2 years, because I butchered a couple, and gave the rest to friends-- where they were noteworthy for escaping coops and getting eaten by predators